Wells DVT score calculator

Wells Score for DVT

Wells' Criteria for DVT

Criteria	No	Yes	Points
Active cancer (treatment within 6 months or palliative)	1		+1
Bedridden recently >3 days or major surgery within 12 weeks	1		+1
Calf swelling >3 cm compared to other leg (measured 10 cm below tibial tuberosity)	1		+1
Collateral superficial veins (non-varicose)	1		+1
Entire leg swollen	1		+1
Localized tenderness along deep venous system	1		+1
Pitting edema confined to symptomatic leg	1		+1
Paralysis, paresis, or recent cast immobilization of lower extremities	1		+1
Previously documented DVT	1		+1
Alternative diagnosis at least as likely as DVT	1		−2
Wells' Score	points

Interpretation (Traditional)
≤0	Low Risk — 5% prevalence of DVT. Consider D-dimer to rule out.
1–2	Moderate Risk — 17% prevalence of DVT. Consider D-dimer or ultrasound.
≥3	High Risk — 53% prevalence of DVT. Ultrasound recommended.
Interpretation (Dichotomized)
≤1	DVT Unlikely — D-dimer to rule out.
≥2	DVT Likely — Ultrasound recommended.

References
Wells PS et al. Value of assessment of pretest probability of DVT. Lancet. 1997;350:1795-1798. PMID 9428249. Wells PS et al. Evaluation of D-dimer in suspected DVT. N Engl J Med. 2003;349:1227-1235. PMID 14507948.